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<html>
	<head>
		<meta charset="utf-8">
		<title>固定定位</title>
		<link rel="stylesheet" href="./css/fixed.css">
	</head>
	<body>
		<div id="father">
			<div class="box1">区块一</div>
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			<div class="box2">区块二</div>
			<div class="box3">区块三</div>
		</div>
	</body>
</html>